Place the olive oil, vinegar, oregano, salt, and pepper in a small jar with a tight-fitting lid. (Alternatively you can use a small bowl and a whisk.)
4 Tablespoons extra virgin olive oil, 3 Tablespoons red wine vinegar, ½ teaspoon dried oregano, salt and pepper
Shake or whisk to combine.
Taste and adjust the seasonings, as needed.
Refrigerate until ready to use. Shake well before using.
Notes
Dressing will keep refrigerated in a jar or bottle with a tight-fitting lid for up to 2 weeks. Shake well before using. If the olive oil has solidified, let the dressing sit at room temperature for a few minutes until it liquifies.